Flow Guitar is a new guitar tablature and learning app, with Lefty support, for iPad. There is a free Lite version. I have no idea what is different between the two, because their descriptions are identical and the official site is a totally blank Facebook page.
Flow Guitar iTunes Description:
Flow Guitar is aimed at all levels of guitar and will teach you to improvise over chord changes, following the chords for a much more melodic solo. Just play the onscreen scales, aiming for the chord tones that are displayed and absorb some music theory along the way.
Go beyond the pentatonic by quickly and easily learning all the diatonic Scales. Perfect for visual learners!
An interactive fretboard shows you scales, modes and chords all over the neck. Find an almost infinite number of chord shapes and voicings in any position! Jam along to one of the 9 included backing tracks, with many more free tracks coming in future updates. As the chords in the progression change, the notes update on the fretboard update to show you the best sounding notes to aim for!
Learn the notes all over the fretboard, how scale shapes and chords fit together and how to write your own progressions.
Jam along to your own backing tracks using the Progression Editor! This feature will be updated regularly with better sounds and patterns.
Fully supports left handers for easy learning!